in contrast to the well funded romney camp, this campaign is a focused grassroots effort. how far will support for santorum reach and threaten romney's chances at a win is yet to be seen on supertuesday. >>> next we go to bangkok to find out what's going on in the region. >> we start in afghanistan. two civilians have died in an attack outside the base where two weeks ago u.s. troops burned korans. the taliban has claimed responsibility saying it was revenge. >>> a suicide bomber detonated explosives at the airfield outside kabul monday evening. an afghan official said at least two civilians died and four others were injured. a taliban spokesperson said the attack was revenge for the burning of islam's holy book. that incident caused uproar in afghanistan. the united states said it was unintentional and apologized. but that hasn't stopped violent protests that have so far killed more than 30 people and wounded hundreds more. >> next to thailand where a symbolic stage of recovery has been reached after last year's devastating floods. bangkok's airport finally re-opened on t